diff --git a/line.py b/line.py
index f9a4487..27eae20 100644
--- a/line.py
+++ b/line.py
@@ -95,7 +95,7 @@ class Line(SecondUomMixin, metaclass=PoolMeta):
             recname += '|%(quantity)s %(uom_symbol)s' % {
                 'quantity': Report.format_number(credit - debit,
                     lang=None, digits=self.quantity_digits),
-                'uom_symbol': self.quantity_uom.symbol,
+                'uom_symbol': getattr(self.quantity_uom, 'symbol', '-'),
                 }
         return recname